Lateralized use of the mouth in production of vocalizations by marmosets.
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We have found that the common marmoset, Callithrix jacchus, displays a larger left hemimouth during production of fear expressions, with or without vocalization, and a larger right hemimouth when producing a social contact call. Thus, marmosets have right hemisphere specialization for the production of negative emotional expressions and vocalizations and left hemisphere specialization for the production of social contact communication. These hemispheric specializations for social communication in marmosets are the same as those found in humans for speech production and for the control of emotional expressions. We suggest that hemispheric specializations for communication in humans may well have precursors in primate evolution.